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arXiv 1208.3553stat.MEmath.STstat.TH
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常规贝叶斯模型选择方法对不相关方案的依赖性

The Dependence of Routine Bayesian Model Selection Methods on Irrelevant Alternatives

Piotr Zwiernik, Jim Q. Smith

摘要:

贝叶斯方法--基于贝叶斯因子或BIC --现在被广泛用于模型选择。任何模型选择方法可能合理要求的一个属性是,如果模型${M}_{1}$优于模型${M}_{0}$,则当这两个模型被表示为一个模型类$\mathbb{M}$的成员时,当它们被嵌入到不同的类$\mathbb{M}'$中时,该偏好被保留。然而,我们在本文中说明,这些常见的贝叶斯程序的通常实施,这个属性不成立,甚至近似。因此,我们主张,要使用这些方法,首先需要存在一个“自然”嵌入类。我们认为,在任何情况下,如在我们运行的例子贝叶斯模型选择的二元系统发育树,没有这样的嵌入。

英文摘要:

Bayesian methods - either based on Bayes Factors or BIC - are now widely used for model selection. One property that might reasonably be demanded of any model selection method is that if a model ${M}_{1}$ is preferred to a model ${M}_{0}$, when these two models are expressed as members of one model class $\mathbb{M}$, this preference is preserved when they are embedded in a different class $\mathbb{M}'$. However, we illustrate in this paper that with the usual implementation of these common Bayesian procedures this property does not hold true even approximately. We therefore contend that to use these methods it is first necessary for there to exist a "natural" embedding class. We argue that in any context like the one illustrated in our running example of Bayesian model selection of binary phylogenetic trees there is no such embedding.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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